18890631616 has 28 divisors (see below), whose sum is σ = 37498116520. Its totient is φ = 9442287360.

The previous prime is 18890631587. The next prime is 18890631677. The reversal of 18890631616 is 61613609881.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18890631616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160951 + ... + 252361.

Almost surely, 2^18890631616 is an apocalyptic number.

18890631616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18890631616 is a deficient number, since it is larger than the sum of its proper divisors (18607484904).

18890631616 is an equidigital number, since it uses as much as digits as its factorization.

18890631616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94652 (or 94642 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 18890631616 in words is "eighteen billion, eight hundred ninety million, six hundred thirty-one thousand, six hundred sixteen".